diff --git a/astroquery/mast/observations.py b/astroquery/mast/observations.py
index efed5b1060..8105b7e67c 100644
--- a/astroquery/mast/observations.py
+++ b/astroquery/mast/observations.py
@@ -173,7 +173,7 @@ def _parse_caom_criteria(self, **criteria):
             # if radius is just a number we assume degrees
             radius = coord.Angle(radius, u.deg)
 
-            # build the coordinates string needed by Mast.Caom.Filtered.Position
+            # build the coordinates string needed by ObservationsClass._caom_filtered_position
             position = ', '.join([str(x) for x in (coordinates.ra.deg, coordinates.dec.deg, radius.deg)])
 
         return position, mashup_filters
@@ -327,7 +327,7 @@ def query_region_count(self, coordinates, radius=0.2*u.deg, pagesize=None, page=
         response : int
         """
 
-        # build the coordinates string needed by Mast.Caom.Filtered.Position
+        # build the coordinates string needed by ObservationsClass._caom_filtered_position
         coordinates = commons.parse_coordinates(coordinates)
 
         # if radius is just a number we assume degrees